摘要:根据①和②.对于所有n≥3.有an+1=an-1+2.(Ⅲ)解:由a2k-1=a2(k-1)-1+2.a1=0.及a2k=a2(k-1)+2.a2=3得a2k-1=2(k-1).a2k=2k+1.k=1.2.3.-.即an=n+(-1)n.n=1.2.3.-.

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